摘要
德都高速公路路堑边坡开挖后挡土墙基础施工时发生变形、垮塌,危及在建高速公路的建设进度,同时致使后缘附近省道S106半幅断道。综合采用地质调查与现场勘探方法,对该滑坡变形特征与稳定性进行了分析。结果显示,滑坡为土质滑坡,前缘因为开挖形成临空面,土体产生拉裂变形,滑带为含砾黏土与灰黑色黏土交界处附近的饱水带。进行相关土工试验及反算获得岩土体强度参数,分别计算天然、暴雨及地震工况下滑坡体的推力,推荐使用暴雨工况下的安全系数进行相关设计,为类似工程提供依据。
The deformation and collapse of the retaining wall foundation occurred during the construction of the retaining wall foundation after the cutting slope of Dedu Expressway was excavated,which endangered the construction progress of the highway under construction and caused the half-cut-off of provincial S106.The deformation characteristics and stability of the landslide are analyzed by means of geological survey and on-site exploration.The results show that the landslide is a soil landslide,the empty surface is formed at the leading edge due to excavation,the soil is subjected to tensile deformation,and the slip zone is a saturated zone near the junction of gravel clay and gray-black clay.Through relevant geotechnical tests and inverse calculation,the strength parameters of rock and soil are obtained,and the thrust of landslide under natural,rainstorm and earthquake conditions is calculated respectively.The safety factor under rainstorm condition is recommended for related design,which provides a basis for related projects.
作者
张肖
刁兆丰
Zhang Xiao;Diao Zhaofeng(Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu Sichuan 610041,China)
出处
《山西建筑》
2023年第12期152-155,共4页
Shanxi Architecture
关键词
高速公路
路堑边坡滑坡
稳定性分析
传递系数法
expressway
cutting landslide
stability analysis
transfer coefficient method
